Answer:
The velocity of ball is 23.19 m/s
Explanation:
Given that,
Mass of football player = 80.0 kg
Mass of ball = 0.430 kg
Distance = 0.538
We need to calculate the time
Using equation of motion

We need to calculate the velocity
Using formula of velocity

We need to calculate the velocity of ball
Using conservation of momentum

Put the value into the formula

The velocity of ball is 23.19 m/s
KE= (1/2) mv²
So, the variables we need to include in our question would be a varable for a mass(m) of an object at some velocity(v).
My Answer:
(This is just an example question, yours can be different)
What is the Kinetic Energy experienced by an bouncy ball rolling at 7m/s (that's your velocity) across a frictionless surface that has a mass(m) of 10 grams?
It does not affect the objects potential energy.
Explanation:
Below is an attachment containing the solution.